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This paper will discuss how Enterprise companies can use Ethernet Native LAN extension platforms to cost effectively deliver multiple applications and more bandwidth to all locations, re

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Ethernet Native LAN Extensions

Solutions for the Enterprise

Solutions for the Enterprise

Overview

In today’s fast paced economic climate, enterprise companies are continually pressured to do more with less, yet they are expanding their reach nationally and globally at a record pace The corporate network is being stretched like never before New applications such as video conferencing and monitoring, file sharing, and Voice over IP (VoIP) demand more bandwidth Regulatory requirements are putting pressure on IT resources for compliance, and remote locations need to receive the same application support and resources as the corporate network – all without increasing cost The network has become

a critical tool and most corporate IT departments are looking to Ethernet as

a solution to help meet the growing list of demands Ethernet Native LAN extensions allow corporations to remove capital and operational costs from their existing network infrastructure New technologies that deliver higher bandwidth at a lower cost per megabit are now available and becoming widely deployed This paper will discuss how Enterprise companies can use Ethernet Native LAN extension platforms to cost effectively deliver multiple applications and more bandwidth to all locations, regardless of where they are located

Native LAN Extension

Native LAN Extension gives enterprise companies the ability to connect their LANs together in such a way that the network is transparent to physical boundaries All of the LANs appear as if they were connected on the same network regardless of location Additionally, Native LAN Extension allows enterprise IT managers to leverage the speed and simplicity of Ethernet to save both capital costs and operational costs in the network With Native LAN Extensions, enterprise companies do not have to learn or manage complex technologies such as SONET/SDH, frame relay or ATM They only work with Ethernet, a familiar LAN technology, and leverage a provider’s expertise and resources in wide area technologies

Native LAN Extension can be deployed in three types of configurations:

• Point-to-Point

• Point-to-Multipoint

• Multipoint-to-Multipoint

Point-to-Point

The Metro Ethernet Forum (MEF) defines a point-to-point connection as an E-Line Ethernet service type that is based

on a point-to-point Ethernet Virtual Connection (EVC) An E-Line service delivers Ethernet-based LAN services across a local or metro serving area from one point to another

Point-to-Multipoint

A point-to-multipoint connection delivers Ethernet-based services across a national or international serving area in a hub-and-spoke topology In this topology, a router or switch at the main enterprise hub node would have to supply the connectivity between the nodes on the end of the spokes

Multipoint-to-Multipoint

A multipoint-to-multipoint topology uses VLAN tags to deliver differentiated Ethernet services from a single or multiple customers over a Native LAN The MEF defines this topology as an E-LAN service, and it is also known as a star topology A star network supplies multipoint-to-multipoint connectivity between all customer nodes

Ethernet over T1/E1

T1/E1 lines and frame relay connections are still the primary mode of transport for enterprise companies of all sizes to reach many of their office locations But despite its ubiquity in the last mile, frame relay cannot offer the bandwidth, flexibility, or scalability that Ethernet can Products are available today that can help enterprise companies leverage their existing T1/E1 infrastructure to deliver business class Ethernet-based services over these lines in place of frame relay Up to 8 T1s can be bonded using the standard Multilink Point-to-Point Protocol (MLPPP) offering up to 12Mb/s (T1) or 16 Mb/s (E1) of service

Customer benefi ts include:

failed links

Core

Bonded T1/E1s T1/E1

Ethernet

VoIP PBX

Switch/Router

Switch/Router

Example of Ethernet over T1/E1

Ethernet over DS3

Most enterprise WAN networks today use DS1 or DS3 connections Most services in place today that use DS3 circuits require an all or none approach – either the entire 45 megabits is used or none is By adding Ethernet services to a DS3, bandwidth can now be groomed to any increment from sub 10megabits up to 45 megabits, allowing a “pay as you grow” approach to service

Customer benefi ts include:

anywhere on the network

Switch/ Router

Switch/ Router

Switch/ Router

Ethernet

Ethernet

Ethernet

VoIP PBX

Traditional PBX

Ethernet

T1 GigE

Regional Office or HQ

Remote Sites

T1s

PBX PSTN

IP/MPLS

DS3 DS3

DS3

Transport Network

Site 1

Site 2

Site 3

Example of Ethernet over DS3

Ethernet over SONET/SDH

Enterprise companies have always wanted to extend the benefits of Ethernet beyond the borders of their Local Area Networks (LANS) to go over Metropolitan Area Networks (MANs) and Wide Area Networks (WANs) to connect remote offices SONET/SDH has been a mainstay in carrier networks for years because of its reliability, consistency of service, and fault recovery strengths As enterprises continue to push Ethernet across multiple locations in a city or region, the industry has responded by developing new ways of transporting Ethernet across different topologies Transporting Ethernet over SONET/SDH gives enterprise companies a “best of both worlds” solution Converged packet access solutions give enterprise companies a way to bridge the TDM and packet worlds to deliver flexible, business class Ethernet services over existing SONET/SDH networks Ethernet over SONET/SDH can also be deployed on private campus network facilities as well

Customer benefi ts include:

these services

MPLS core

Remote Office

Large Office

Ethernet

Remote Fiber Attached Office

Ethernet Ethernet Metro

SONET/SDH Network

HQ

LEC

ADM

ADM

PSTN

IP/MPLS

Core

PBX

ADM

Example of Ethernet over SONET/SDH

MultiService Ethernet

Many enterprise networks today require a separate physical circuit for each voice and data network offering This scenario allows for the enterprise company to provide access to most of its locations Traffic can be kept totally separate or can be bridged across all locations to form a single LAN Additionally, the headquarters location can aggregate multiple discrete circuits or larger channelized links (such as channelized DS3), if need be Converged packet access solutions give enterprise companies a way to deliver multiservice Ethernet to all locations, regardless of where they are located, all over the same platform

Customer benefi ts include:

T1/E1 T1/E1

Ethernet T1/E1 T1/E1

Ethernet

ch DS3 (MLPPP) DS3 OC-3/STM-1 OC-12/STM-4

NxT1/E1 DS3/NxDS3

OC-3/STM-1 OC-12/STM-4

Service provider or private network

Ethernet

Ethernet

Example of MultiService Ethernet

calls to be delivered seamlessly over a packet-based network, there must be a sub-50 millisecond resiliency in place to ensure voice calls can be carried seamlessly across the network Layer 2/3 switches generally take much longer to switchover in the event of a failure but protected switching ring solutions now exist and can be deployed that give enterprise companies a solution for sub-50 millisecond resiliency

Storage Network & WAN Back-up

The explosion of data generated and used by businesses has made storage a critical priority for enterprises of all sizes In addition, numerous pieces of legislation have required the remote archiving and protection of data This huge increase in storage and storage extension has made network uptime a critical function Ethernet Native LAN extensions can facilitate the implementation of a cost effective resilient network designed to support the transport of large amounts of information

Summary

Ethernet Native LAN Extension solutions provide cost effective, ubiquitous solutions to enterprise companies for their converged packet applications for voice, video and data Flexible bandwidth and existing facilities ranging including Nx T1/E1, DS3, OC3/STM1, OC12/STM3 and GigE can be used

to provide an integrated, cost effective solution optimized for each location within the enterprise company These Native LAN Extensions can also be provided over Carrier provided leased facilities or private enterprise networks

GigE with sub - 50 msec PSR 10/100/100 T1/E1, NxT1/E1, DS3,

OC-3/STM-1, OC-12/STM-4

Example of Resilient Ethernet